Merge upstream/main into iXex PR branch (#13086)

Catches the iXex/IDEX parallel-printing branch up to upstream main
(102 commits). Two content conflicts resolved:

- src/libslic3r/Preset.cpp: s_Preset_printer_options — kept upstream's
  new "use_3mf" key and our iMEX printer-capability/mode keys.
- tests/fff_print/test_gcodewriter.cpp: upstream revived the disabled
  suite (#14196), dropping the obsolete [.]-tagged lift() test and its
  config_lift_unlift.ini; kept their set_speed + z_hop tests and appended
  our 10 per-firmware set_pressure_advance/set_temperature scenarios.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/slic3r/GUI/GCodeViewer.cpp

@@ -1351,18 +1351,26 @@ void GCodeViewer::load_as_gcode(const GCodeProcessorResult& gcode_result, const
 
     // load_toolpaths(gcode_result, build_volume, exclude_bounding_box);
     
-    // ORCA: Only show filament/color print preview if more than one tool/extruder is actually used in the toolpaths.
-    // Only reset back to Toolpaths (FeatureType) if we are currently in ColorPrint and this load is single-tool.
-    if (m_viewer.get_used_extruders_count() > 1) {
-        auto it = std::find(view_type_items.begin(), view_type_items.end(), libvgcode::EViewType::ColorPrint);
-        if (it != view_type_items.end())
-            m_view_type_sel = std::distance(view_type_items.begin(), it);
-        set_view_type(libvgcode::EViewType::ColorPrint);
-    } else if (get_view_type() == libvgcode::EViewType::ColorPrint) {
-        auto it = std::find(view_type_items.begin(), view_type_items.end(), libvgcode::EViewType::FeatureType);
-        if (it != view_type_items.end())
-            m_view_type_sel = std::distance(view_type_items.begin(), it);
-        set_view_type(libvgcode::EViewType::FeatureType);
+    // ORCA: Apply smart default view type when extruder count changes.
+    // Multi-color: ColorPrint (Filament), Single-color: FeatureType (Line Type).
+    // User selections persist within same extruder count, defaults reapply on count change.
+    int current_count = m_viewer.get_used_extruders_count();
+    if (current_count > 1) {
+        if (m_last_extruder_count_default_applied != 2) {
+            auto it = std::find(view_type_items.begin(), view_type_items.end(), libvgcode::EViewType::ColorPrint);
+            if (it != view_type_items.end())
+                m_view_type_sel = std::distance(view_type_items.begin(), it);
+            set_view_type(libvgcode::EViewType::ColorPrint);
+            m_last_extruder_count_default_applied = 2;
+        }
+    } else {
+        if (m_last_extruder_count_default_applied != 1) {
+            auto it = std::find(view_type_items.begin(), view_type_items.end(), libvgcode::EViewType::FeatureType);
+            if (it != view_type_items.end())
+                m_view_type_sel = std::distance(view_type_items.begin(), it);
+            set_view_type(libvgcode::EViewType::FeatureType);
+            m_last_extruder_count_default_applied = 1;
+        }
     }
 
     // BBS: data for rendering color arrangement recommendation
@@ -1462,18 +1470,6 @@ void GCodeViewer::load_as_gcode(const GCodeProcessorResult& gcode_result, const
             m_viewer.set_time_mode(libvgcode::convert(PrintEstimatedStatistics::ETimeMode::Normal));
     }
 
-    // set to color print by default if use multi extruders
-    if (m_viewer.get_used_extruders_count() > 1) {
-        for (int i = 0; i < view_type_items.size(); i++) {
-            if (view_type_items[i] == libvgcode::EViewType::ColorPrint) {
-                m_view_type_sel = i;
-                break;
-            }
-        }
-
-        set_view_type(libvgcode::EViewType::ColorPrint);
-    }
-
     bool only_gcode_3mf = false;
     PartPlate* current_plate = wxGetApp().plater()->get_partplate_list().get_curr_plate();
     bool current_has_print_instances = current_plate->has_printable_instances();
@@ -2973,8 +2969,14 @@ void GCodeViewer::render_all_plates_stats(const std::vector<const GCodeProcessor
         {
             auto plate_print_statistics = plate->get_slice_result()->print_statistics;
             auto plate_extruders = plate->get_extruders(true);
+            auto max_extruders_colors = wxGetApp().plater()->get_extruders_colors().size();
             for (size_t extruder_id : plate_extruders) {
                 extruder_id -= 1;
+                // Skip stale/overflow extruder indices (e.g. from object assignments that outlived a
+                // filament-count change) so downstream per-extruder lookups stay in range. Ported
+                // from BambuStudio (STUDIO-15763).
+                if (extruder_id >= max_extruders_colors)
+                    continue;
                 if (plate_print_statistics.model_volumes_per_extruder.find(extruder_id) == plate_print_statistics.model_volumes_per_extruder.end())
                     model_volume_of_extruders_all_plates[extruder_id] += 0;
                 else {
@@ -3127,7 +3129,7 @@ void GCodeViewer::render_all_plates_stats(const std::vector<const GCodeProcessor
         ImGui::Dummy(ImVec2(0.0f, ImGui::GetFontSize() * 0.1));
         ImGui::Dummy({ window_padding, window_padding });
         ImGui::SameLine();
-        imgui.title(_u8L("Total Estimation"));
+        imgui.title(_u8L("Total estimation"));
 
         ImGui::Dummy({ window_padding, window_padding });
         ImGui::SameLine();
@@ -4014,8 +4016,8 @@ void GCodeViewer::render_legend(float &legend_height, int canvas_width, int canv
         append_headers({{_u8L("Line Type"), offsets[0]}, {_u8L("Time"), offsets[1]}, {"%", offsets[2]}, {_u8L("Usage"), offsets[3]}, {_u8L("Display"), offsets[5]}});
         break;
     }
-    case libvgcode::EViewType::Height:         { imgui.title(_u8L("Layer Height (mm)")); break; }
-    case libvgcode::EViewType::Width:          { imgui.title(_u8L("Line Width (mm)")); break; }
+    case libvgcode::EViewType::Height:         { imgui.title(_u8L("Layer height (mm)")); break; }
+    case libvgcode::EViewType::Width:          { imgui.title(_u8L("Line width (mm)")); break; }
     case libvgcode::EViewType::Speed:
     {
         imgui.title(_u8L("Speed (mm/s)"));
@@ -4036,7 +4038,7 @@ void GCodeViewer::render_legend(float &legend_height, int canvas_width, int canv
         imgui.title(_u8L("Jerk (mm/s)"));
         break;
     }
-    case libvgcode::EViewType::FanSpeed:       { imgui.title(_u8L("Fan Speed (%)")); break; }
+    case libvgcode::EViewType::FanSpeed:       { imgui.title(_u8L("Fan speed (%)")); break; }
     case libvgcode::EViewType::Temperature:    { imgui.title(_u8L("Temperature (°C)")); break; }
 // ORCA: Add Pressure Advance visualization support
     case libvgcode::EViewType::PressureAdvance:{ imgui.title(_u8L("Pressure Advance")); break; }
@@ -4184,7 +4186,7 @@ void GCodeViewer::render_legend(float &legend_height, int canvas_width, int canv
         }
         else if (type == libvgcode::EOptionType::ToolChanges) {
             const auto option_values = option_stats(type);
-            append_option_item_with_type(type, libvgcode::convert(m_viewer.get_option_color(libvgcode::EOptionType::ToolChanges)), _u8L("Filament Changes"), visible,
+            append_option_item_with_type(type, libvgcode::convert(m_viewer.get_option_color(libvgcode::EOptionType::ToolChanges)), _u8L("Filament changes"), visible,
                 option_values[0], option_values[1], option_values[2], option_values[3]);
         }
         else if (type == libvgcode::EOptionType::Wipes) {
@@ -4881,7 +4883,7 @@ void GCodeViewer::render_legend(float &legend_height, int canvas_width, int canv
 
     // total estimated printing time section
     ImGui::Spacing();
-    std::string time_title = m_viewer.get_view_type() == libvgcode::EViewType::FeatureType ? _u8L("Total Estimation") : _u8L("Time Estimation");
+    std::string time_title = m_viewer.get_view_type() == libvgcode::EViewType::FeatureType ? _u8L("Total estimation") : _u8L("Time Estimation");
     auto can_show_mode_button = [this](libvgcode::ETimeMode mode) {
         std::vector<std::string> time_strs;
         for (size_t i = 0; i < m_print_statistics.modes.size(); ++i) {